Provide label for tableselect checkboxes.

The solution taken is slighly different from proposed, because I used the Classy template approach.
But for sure the issue is the same as reported.

With a standard install of Drupal 8.9.11 with Bootstrap Barrio v5.4.1 or the dev version as the default and admin theme the label is always displayed.

On tableselect tables such as on the content or user page when using a standard checkbox the checkbox is displayed over the top of the label but the checkbox can be ticked.

When using custom or switch for checkboxes on forms I see the label rendered to the right of the tickbox and if I click on it then the line is selected but the checkbox or switch remains unchecked.

Custom and switches work fine elsewhere.

Am I missing something?

I think that this has to add the css class visually-hidden to the printed label tag when label_display is set to invisible, like checkboxes on tableselect tables.

I'm doing this workaround on my subtheme:

function bootstrap_sass_preprocess_form_element(&$variables) {
  if ($variables['type'] === 'checkbox' && $variables['label_display'] === 'invisible') {
    if (!isset($variables['label_attributes'])) {
      $variables['label_attributes'] = new \Drupal\Core\Template\Attribute(['class' => 'visually-hidden']);
    }
    else {
      /** @var \Drupal\Core\Template\Attribute $attr */
      $attr = $variables['label_attributes'];
      $attr->addClass('visually-hidden');
    }
  }
}